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At what temperature does the water have the highest density?

0°C (32°F)
100°C (212°F)
-273°C (-459.4°F)
4°C (39.2°F)
Increasing the temperature generally decreases the density, but water is a notable exception: the density of water increases between its melting point at 0 °C and 4 °C. Similar behavior is observed in silicon at low temperatures.
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Answers by country

0°C (32°F)
100°C (212°F)
-273°C (-459.4°F)
4°C (39.2°F)
answers
flagEstonia
0%
0%
0%
100%
10
flagGhana
8%
0%
0%
91%
12
flagSingapore
0%
10%
10%
80%
10
flagMalaysia
8%
8%
0%
75%
12
flagthe United States
14%
8%
10%
66%
125
flagIndia
14%
7%
11%
65%
188
flagAustria
7%
7%
22%
62%
54
flagthe Netherlands
18%
12%
6%
62%
16
flagCanada
7%
15%
15%
61%
13
flagPakistan
21%
4%
13%
60%
23
flagGreece
20%
6%
13%
60%
15
flagSwitzerland
14%
7%
19%
58%
41
flagAustralia
16%
6%
12%
58%
31
flagGermany
17%
6%
21%
54%
348
flagNigeria
40%
0%
20%
40%
10
flagRepublic of Ireland
36%
18%
9%
36%
11
flagPoland
29%
13%
20%
35%
6620
flagthe United Kingdom
33%
6%
27%
32%
74

What sound can be heard when approaching an iceberg?

a cracking noise
a fizz
a roar
a whisper

Where is the saltiest lake in the world?

in Antarctica
In Australia
in Israel
in Turkmenistan

At what temperature does water boil at the top of Mt Everest?

68°C (154.4°F)
101,4°C (213,8°F)
100°C (212°F)
98,6°C (208,4°F)

What ions are formed during self-ionization of water?

H₃O + and OH-
HO₂- and H₂O
OH + and H₃O-
All answers are correct